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Mitsubishi Galant (2004+). Manual - part 413

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-263

STEP 49. Check the CAN_L line inside the ABS-ECU for
short to ground. Measure the resistance at ABS-ECU

connector A-02.

CAUTION

A digital multimeter should be used. For details refer to

P.54C-4

CAUTION

The test wiring harness should be used. For details refer to

P.54C-4

(1) Disconnect ABS-ECU connector A-02.

(2) Connect special tool MB991970 (ABS check harness) to

the ABS-ECU and the wiring harness, and measure the
resistance at special tool MB991970 (ABS check harness).

(3) Turn the ignition switch to the "LOCK" (OFF) position.

CAUTION

Disconnect the negative battery terminal. For details refer
to

P.54C-4

(4) Disconnect the negative battery terminal.
(5) Measure the resistance between special tool MB991970

(ABS check harness) connector terminal 7 and body
ground.

OK: 1 k

Ω or more

Q: Does the resistance measure 1 k

Ω or more?

YES : If the resistance measures 1 k

Ω or more, diagnose

CAN bus lines thoroughly by referring to

P.54C-498

NO : If the resistance measures less than 1 k

Ω, replace the

ABS-ECU.

AC305206

CONNECTOR: A-02

A-02 (GR)

HARNESS SIDE

AC209767

TEST
HARNESS

22 21

SPECIAL TOOL
MB991970

ABS-
ECU

SPECIAL TOOL MB991970
CONNECTOR

MEASUREMENT CONNECTOR

CONTINUE

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-264

54C

DIAGNOSTIC ITEM 6: Diagnose shorts in the ground to CAN bus line <Vehicles with ABS and vehicles
with multi-center display (middle-grade type)>

CAUTION

When servicing a CAN bus line, ground yourself
by touching a metal object such as an unpainted
water pipe. If you fail to do so, a component con-
nected to the CAN bus line may be damaged.

DATA LINK
CONNECTOR

ETACS-ECU

POWERTRAIN
CONTROL
MODULE

JOINT
CONNECTOR (3)

COMBINATION
METER

A/C-ECU

SRS-ECU

ABS-ECU

MULTI CENTER
DISPLAY UNIT

DIAGNOSIS

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CONTROLLER AREA NETWORK (CAN)

54C-265

TROUBLE JUDGMENT
A short to ground may be present when the voltage
between the CAN bus line (CAN_L or CAN_H) and
body ground is less than 1.0 V. In this condition, an
abnormal voltage may be measured at CAN_L and
CAN_H lines.

COMMENTS ON TROUBLE SYMPTOM
The wiring harness wire or connectors may have
loose, corroded, or damage terminals, or terminals
pushed back in the connector, or an ECU may be
defective.

TROUBLESHOOTING HINTS

• The wiring harness or connectors may have

loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector

• The ETACS-ECU may be defective

• The combination meter may be defective

• The A/C-ECU may be defective

• The multi-center display unit (middle-grade type)

may be defective

• The SRS-ECU may be defective

• The ABS-ECU may be defective

• The powertrain control module may be defective

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991970: ABS Check Harness

AC305206

CONNECTOR: A-02

A-02 (GR)

AC306248AB

B-19 (B)

CONNECTOR: B-19

AIR
CLEANER

PCM

AC305231BZ

C-101

C-125 (B)

C-29

C-02

CONNECTORS: C-02, C-29, C-101, C-125

AC305233AV

CONNECTORS: C-05, C-15, C-22, C-121

C-121 (Y)

C-22 (Y)

C-15 (B)

C-05 (B)

AC305413

C-218 (GR)

CONNECTOR: C-218

JUNCTION BLOCK
(REAR VIEW)

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-266

STEP 1. Check powertrain control module connector B-19,
combination meter connector C-101 and data link
connector C-125 for loose, corroded or damaged
terminals, or terminals pushed back in the connector.

CAUTION

The strand end of the twisted wire should be within 10 cm
(4 inches) from the connector. For details refer to

P.54C-4

Q: Are powertrain control module connector B-19,

combination meter connector C-101 and data link
connector C-125 in good condition?
YES : Go to Step 2.
NO : Repair the damaged parts.

AC306248AD

B-19 (B)

CONNECTOR: B-19

PCM

AIR
CLEANER

HARNESS SIDE

AC305232

CONNECTORS: C-101, C-125

C-101

C-125

C-125 (B)

C-101 HARNESS SIDE

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